mykey.h

#ifndef __MYKEY_H__
#define __MYKEY_H__

#include "stm32mp1xx_exti.h"
#include "stm32mp1xx_gic.h"
#include "stm32mp1xx_gpio.h"
#include "stm32mp1xx_rcc.h"

void key1_init();
void key2_init();
void key3_init();

#endif

mykey.c

#include "mykey.h"

void key1_init()
{
    RCC->MP_AHB4ENSETR |= (0X3 << 4);
    GPIOE->MODER &= (~(0X3<<20));
     GPIOE->MODER  |= (0x1<<20);
     //設(shè)置PF10為輸出
     GPIOF->MODER&= (~(0X3<<20));
     GPIOF->MODER  |= (0x1<<20);
     //設(shè)置PE8為輸出
     GPIOE->MODER &= (~(0X3<<16));
     GPIOE->MODER  |= (0x1<<16);
 
     //設(shè)置PE10為推挽輸出
     GPIOE->OTYPER &= (~(0X1<<10));
     //設(shè)置PF10為推挽輸出
     GPIOF->OTYPER &= (~(0X1<<10));
     //設(shè)置PE8為推挽輸出
     GPIOE->OTYPER &= (~(0X1<<8));
 
     //設(shè)置PE10為低速輸出
     GPIOE->OSPEEDR &= (~(0X3<<20));
     //設(shè)置PF10為低速輸出
     GPIOF->OSPEEDR &= (~(0X3<<20));
     //設(shè)置PE8為低速輸出
     GPIOE->OSPEEDR &= (~(0X3<<16));
 
     //設(shè)置PE10輸出無上拉下拉電阻
    GPIOE->PUPDR &= (~(0X3<<20));
     //設(shè)置PF10輸出無上拉下拉電阻
    GPIOF->PUPDR &= (~(0X3<<20));
     //設(shè)置PE8輸出無上拉下拉電阻
    GPIOE->PUPDR &= (~(0X3<<16));
 
     //三盞燈默認是關(guān)閉
    GPIOE->ODR &= (~(0X1<<10));
    GPIOF->ODR &= (~(0X1<<10));
    GPIOE->ODR &= (~(0X1<<8));

    RCC->MP_AHB4ENSETR |= (0X5 << 5);
    GPIOF->MODER &= (~(0X3 << 14));
    EXTI->EXTICR2 &= (~(0XFF << 24));
    EXTI->EXTICR2 |= (0X5 << 24);
    EXTI->FTSR1 |= (0X1 << 7);
    EXTI->C1IMR1 |= (0X1 << 7);
    GICD->CTRL |= 0X1;
    GICD->ISENABLER[3] |= (0X1 << 1);
    GICD->IPRIORITYR[24] &= (~(0X1F << 11));
    GICD->ITARGETSR[24] &= (~(0X03 << 8));
    GICD->ITARGETSR[24] |= (0X1 << 8);
    GICC->CTRL |= 0X1;
    GICC->PMR |= 0X1F;
}

void key2_init()
{
    RCC->MP_AHB4ENSETR |= (0X3 << 4);
    GPIOF->MODER &= (~(0X3 << 12));
    GPIOF->MODER |= (0X1 << 12);
    GPIOF->OTYPER &= (~(0X1<<6));
    GPIOF->OSPEEDR &= (~(0X3<<12));
    GPIOF->PUPDR &= (~(0X3<<12));
    GPIOF->ODR &= (~(0X1<<6));

    RCC->MP_AHB4ENSETR |= (0X5 << 5);
    GPIOF->MODER &= (~(0X3 << 16));
    EXTI->EXTICR3 &= (~(0XFF));
    EXTI->EXTICR3 |= 0X5;
    EXTI->FTSR1 |= (0X1 << 8);
    EXTI->C1IMR1 |= (0X1 << 8);
    GICD->CTRL |= 0X1;
    GICD->ISENABLER[3] |= (0X1 << 2);
    GICD->IPRIORITYR[24] &= (~(0X1F << 19));
    GICD->ITARGETSR[24] &= (~(0X03 << 16));
    GICD->ITARGETSR[24] |= (0X1 << 16);
    GICC->CTRL |= 0X1;
    GICC->PMR |= 0X1F;
}

void key3_init()
{
    RCC->MP_AHB4ENSETR |= (0X3 << 4);
    GPIOE->MODER &= (~(0X3 << 18));
    GPIOE->MODER |= (0X1 << 18);
    GPIOE->OTYPER &= (~(0X1<<9));
    GPIOE->OSPEEDR &= (~(0X3<<18));
    GPIOE->PUPDR &= (~(0X3<<18));
    GPIOE->ODR &= (~(0X1<<9));

    RCC->MP_AHB4ENSETR |= (0X5 << 5);
    GPIOF->MODER &= (~(0X3 << 18));
    EXTI->EXTICR3 &= (~(0XFF << 8));
    EXTI->EXTICR3 |= (0X5 << 8);
    EXTI->FTSR1 |= (0X1 << 9);
    EXTI->C1IMR1 |= (0X1 << 9);
    GICD->CTRL |= 0X1;
    GICD->ISENABLER[3] |= (0X1 << 3);
    GICD->IPRIORITYR[24] &= (~(0X1F << 27));
    GICD->ITARGETSR[24] &= (~(0X03 << 24));
    GICD->ITARGETSR[24] |= (0X1 << 24);
    GICC->CTRL |= 0X1;
    GICC->PMR |= 0X1F;
}

do_irq.c

#include "mykey.h"
extern void printf(const char *fmt, ...);
unsigned int i = 0;
int flag1 = 0;
int flag2 = 0;
int flag3 = 0;
void do_irq(void) 
{
    
    unsigned int a = (GICC->IAR & 0X3FF);
    switch (a)
    {
    case 97:
        printf("key2\n");
        flag2 = !flag2;
        if(flag2 == 1)
        {
            GPIOF->ODR |= (0X1<<6);

        }
        if (flag2 == 0)
        {
            GPIOF->ODR &= (~(0X1<<6));
            
        }
        
        EXTI->FPR1 |= (0X1 << 7);
        GICD->ICPENDR[3] |= (0X1 << 1);
        break;
    case 98:
        printf("key3\n");
        flag1 = !flag1;
        if(flag1 == 1)
        {
            GPIOE->ODR |= (0X1<<10);
            GPIOF->ODR |= (0X1<<10);
            GPIOE->ODR |= (0X1<<8);
        }
        if (flag1 == 0)
        {
            GPIOE->ODR &= (~(0X1<<10));
            GPIOF->ODR &= (~(0X1<<10));
            GPIOE->ODR &= (~(0X1<<8));
        }
        EXTI->FPR1 |= (0X1 << 8);
        GICD->ICPENDR[3] |= (0X1 << 2);
        break;
    case 99:
        printf("key1\n");
        flag3 = !flag3;
        if(flag3 == 1)
        {
            GPIOE->ODR |= (0X1<<9);
            
        }
        if (flag3 == 0)
        {
            GPIOE->ODR &= (~(0X1<<9));
            
        }
        EXTI->FPR1 |= (0X1 << 9);
        GICD->ICPENDR[3] |= (0X1 << 3);
        break;
    default:
        break;
    }
    GICC->EOIR = a;
}

main.c文章來源地址http://www.zghlxwxcb.cn/news/detail-860678.html

#include "mykey.h"
extern void printf(const char *fmt, ...);
void delay_ms(int ms)
{
    int i,j;
    for(i=0;i<ms;i++)
    {
        for(j=0;j<2000;j++)
        {
 
        }
    }
}
int main()
{
    key1_init();
    key2_init();
    key3_init();
    while (1)
    {
        printf("hello world\n");
        delay_ms(1000);
    }
    
}

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